TabView@DeleteCases[$Failed]@
Map[ToExpression[#, StandardForm, Hold] &]@
Flatten@Cases[
Import["https://mathematica.stackexchange.com/questions/286330/\
how-to-put-an-expression-after-d-in-integration", "XMLObject"],
XMLElement["pre", _, t_] :>
Cases[t, XMLElement["code", _, c_] :> c, Infinity], Infinity]